Tweco FP-95 Mini MIG - Manual (Page 37)

SERVICE FIREpOwER Fp-95
Service 5-3 Manual 0-5122
5.05 Power Source Problems
FAULT CAUSE REMEDY
1 Primary line voltage is
ON. Welding arc can not
be established.
A Primary fuse is blown. A Replace primary fuse.
B Broken connection in pri-
mary circuit.
B Have an Accredited THERMAL ARC Service Agent check
primary circuit.
2 Primary line voltage is
ON but when the MIG
Gun trigger switch is
depressed nothing hap-
pens.
MIG Gun trigger switch leads
are disconnected.
Reconnect.
3 Primary line voltage is
ON, no wire feed but gas
flows from the MIG Gun
when the torch trigger
switch is depressed.
A Electrode wire stuck in wire
liner or contact tip (burn-
back jam).
A Check for clogged / kinked MIG Gun wire liner or worn
contact tip. Replace faulty component(s).
B Faulty control PCB B Have an Accredited THERMAL ARC Service Agent in-
vestigate the fault.
4 Wire feeds when the
MIG Gun trigger switch
is depressed but arc can
not be established.
Poor or no work lead con-
nection.
Clean work clamp area and ensure good electrical
contact.
5 Jerky wire feed A Worn or dirty contact tip A Replace
B Worn feed roller. B Replace
C Excessive back tension from
wire reel hub.
C Reduce brake tension on spool hub
D Worn, kinked or dirty conduit
liner
D Clean or replace conduit liner
6
Thermal Overtemp Light
is ON and Fan motor is
running
The machine duty cycle has
been exceeded.
Allow the fan to run so machine can cool down. When
light goes out, welding may resume.
7
Thermal Overtemp Light
turns on in less than 30
seconds during weld-
ing.
Fan has stopped running or
fuse on PCB has blown
Have an Accredited THERMAL ARC Service Agent re-
place the fuse.
Table 5-2: Power Source Problems